Handling Data 3 summary

Key learning points

• Plot cumulative frequency at upper class boundaries.
• Estimate the median and IQR from the curve.
• Compare medians (location) and IQRs (spread).
• Use consistent accuracy.

Worked example 1 — Median CF

For 100 observations, which cumulative frequency marks the median?

Working

Half of the total frequency.

Worked example 2 — Plot cumulative frequency at upper class boundaries

Use this method from the Handling Data 3 sheet: Plot cumulative frequency at upper class boundaries.

Working

Each key learning point matches a question type on the printable worksheet.

Worked example 3 — Estimate the median and IQR from the curve

Use this method from the Handling Data 3 sheet: Estimate the median and IQR from the curve.

Working

Each key learning point matches a question type on the printable worksheet.

Worked example 4 — Compare medians (location) and IQRs (spread)

Use this method from the Handling Data 3 sheet: Compare medians (location) and IQRs (spread).

Working

Each key learning point matches a question type on the printable worksheet.

Worked example 5 — Use consistent accuracy

Use this method from the Handling Data 3 sheet: Use consistent accuracy.

Working

Each key learning point matches a question type on the printable worksheet.

Scaffolded Learning Sheet and answers (PDFs)

This page is a short, searchable overview for revision and search engines. Use the Scaffolded Learning Sheet first, then the Answers PDF for a full written solution. The printable PDFs remain the main classroom resource.